BQ27Z746: Batt Sense Status 寄存器BCN置位了，这个具体是什么原因造成的，有什么影响

? ?

Prodigy 70 points

Part Number: BQ27Z746

Hi TI团队，

现在遇到一个问题，使用BQ27Z746 Batt Sense Status 寄存器显示触发BCN了，但是充放电又是正常，这个具体有什么影响，有哪些因素会引起这个寄存器置位呢，指南手册里写着与Pack+/Pack-短路了

8 天前

0 Daniel 8 天前

TI__Mastermind 36625 points

您好

https://www.ti.com.cn/cn/lit/ug/sluucw8/sluucw8.pdf

For accurate battery voltage sensing when using the sensing buffer, the PACK pin must be powered and VPACK > VBAT + 0.7 V. The sensing protection thresholds (BCP, BCN, BDP, and BDN) provide short detection for the battery sensing output pins, and places the battery sensing output pins in a high impedance state when triggered. The BQ27Z746 battery sensing has firmware programmable offset options for applications where differential output voltage needs to be shifted to overcome an input range limitation. The offset voltage selected should never exceed the sensing protection thresholds, because this causes false battery sensing faults.

这是具体影响说明。

0 ? ? 8 天前回复 Daniel

Prodigy 70 points

你好，感谢回复，我也有在指南里看到这个，但是我还是不明白，我想知道的是，如果触发了BCP, BCN, BDP, and BDN其中任何一个，会对电池性能造成什么影响呢

0 Daniel 8 天前回复 ? ?

TI__Mastermind 36625 points

您好

The BQ27Z746 battery sensing has firmware programmable offset options fortions where differential output voltage needs to be shifted to overcome an input range limitation. The offset voltage selected should never exceed the sensing protection thresholds, because this causes false battery sensing faults.

这部分说的很清楚，会影响后续对于电池感应的报错。对于电池本身影响更多的是如果您不去管这个部分，长时间会影响电池性能。